JELOK pipe Fittings materials include stainless steel, alloy 400/R-405, brass, and carbon steel. JELOK provides NPT, ISO/BSP, SAE, and ISO threads configurations. JELOK’s pipe fittings are available in a variety of sizes, materials, and configurations. Our range includes pipe connectors and pipe and port adapters that are also available in a wide array of thread types. They are designed to provide leak-free connections and are suitable for use across a variety of applications that support many of today’s major industrial markets.